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VM hiccups during file copy in Windows 2012 and SMB 3.0

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Hello!

I have built the cluster with 4 Hyper-V cluster hosts and a storage over SMB 3.0. Everything is working fine on the hosts and storage when I copy a file of 4GB+. The problem appears when I copy the file to one of the VMs that is hosted on the storage.

Here is what I get:

The speed in this case falls to 15MBps. In the beginning it was looking good for about 10 seconds. The speed was averaging to 90MBps. I am copying the file from another physical workstation outside of the cluster but connected to the same physical switch.

Any idea on why it can happened? Have I created the SMB Share wrong? Configurations? The same host can accept the same file with the full 1Gbps speed.

Thank you!


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